linux-toradex.git/drivers/usb/misc/ldusb.c, branch v2.6.29.3

USB: remove vernier labpro from ldusb

2009-01-28T00:15:36+00:00

Labpro device is in both ldusb and vstusb device tables.
Should only be a vstusb device.

Signed-off-by: stephen ware 
Signed-off-by: Greg Kroah-Hartman

USB: remove PICDEM FS USB demo (04d8:000c) device from ldusb

2008-05-14T17:00:29+00:00

Microchip has changed the PICDEM FS USB demo device (0x04d8:000c)
to use bulk transfer and not interrupt transfer. So I've updated the libusb
based program here (Post #31).
	http://forum.microchip.com/tm.aspx?m=106426&mpage=2

So I believe that the in-kernel ldusb driver will no longer work with the
demo firmware.  It should be removed.


Signed-off-by: Xiaofan Chen 
Cc: Michael Hund 
Cc: stable 
Signed-off-by: Greg Kroah-Hartman

usb: ldusb: ld_usb semaphore to mutex

2008-05-02T17:25:51+00:00

Signed-off-by: Daniel Walker 
Acked-by: Matthew Wilcox 
Signed-off-by: Greg Kroah-Hartman

USB: replace remaining FUNCTION occurrences

2008-04-25T04:16:55+00:00

__FUNCTION__ is gcc-specific, use __func__

Signed-off-by: Harvey Harrison 
Signed-off-by: Greg Kroah-Hartman

USB: add new vernier product id to ldusb.c

2008-02-21T23:38:53+00:00

I have a new ldusb device to go into the device table. Jiri has merged
the change for hiddev quirks already.


From: Stephen Ware 
Signed-off-by: Greg Kroah-Hartman

USB: misc: ldusb: clean up urb->status usage

2007-07-20T00:46:07+00:00

This done in anticipation of removal of urb->status, which will make
that patch easier to review and apply in the future.

Signed-off-by: Greg Kroah-Hartman

USB: prevent char device open/deregister race

2007-07-12T23:29:48+00:00

This patch (as908) adds central protection in usbcore for the
prototypical race between opening and unregistering a char device.
The spinlock used to protect the minor-numbers array is replaced with
an rwsem, which can remain locked across a call to a driver's open()
method.  This guarantees that open() and deregister() will be mutually
exclusive.

The private locks currently used in several individual drivers for
this purpose are no longer necessary, and the patch removes them.  The
following USB drivers are affected: usblcd, idmouse, auerswald,
legousbtower, sisusbvga/sisusb, ldusb, adutux, iowarrior, and
usb-skeleton.

As a side effect of this change, usb_deregister_dev() must not be
called while holding a lock that is acquired by open().  Unfortunately
a number of drivers do this, but luckily the solution is simple: call
usb_deregister_dev() before acquiring the lock.

In addition to these changes (and their consequent code
simplifications), the patch fixes a use-after-free bug in adutux and a
race between open() and release() in iowarrior.

Signed-off-by: Alan Stern 
Signed-off-by: Greg Kroah-Hartman

USB: ldusb bugfix

2007-05-23T06:45:51+00:00

This patch fixes a problem reported with consecutive reads in the ldusb
driver.

Signed-off-by: Oliver Neukum 
Signed-off-by: Greg Kroah-Hartman

USB: add picdem device to ldusb

2007-04-27T20:28:42+00:00

Hi Greg:

I have found that  /drivers/usb/misc/ldusb.c  works with the "PICDEM Full
Speed USB"
http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1406&dDocName=en021940


Signed-off-by: Joey S Goncalves 
Cc: Michael Hund 
Signed-off-by: Greg Kroah-Hartman

IRQ: Maintain regs pointer globally rather than passing to IRQ handlers

2006-10-05T14:10:12+00:00

Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.

The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around.  On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).

Where appropriate, an arch may override the generic storage facility and do
something different with the variable.  On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.

Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions.  Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller.  A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.

I've build this code with allyesconfig for x86_64 and i386.  I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.

This will affect all archs.  Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:

	struct pt_regs *old_regs = set_irq_regs(regs);

And put the old one back at the end:

	set_irq_regs(old_regs);

Don't pass regs through to generic_handle_irq() or __do_IRQ().

In timer_interrupt(), this sort of change will be necessary:

	-	update_process_times(user_mode(regs));
	-	profile_tick(CPU_PROFILING, regs);
	+	update_process_times(user_mode(get_irq_regs()));
	+	profile_tick(CPU_PROFILING);

I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().

Some notes on the interrupt handling in the drivers:

 (*) input_dev() is now gone entirely.  The regs pointer is no longer stored in
     the input_dev struct.

 (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking.  It does
     something different depending on whether it's been supplied with a regs
     pointer or not.

 (*) Various IRQ handler function pointers have been moved to type
     irq_handler_t.

Signed-Off-By: David Howells 
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)